CASE 14: Mid-age male patient with neurological problems

This next case had an interesting clinical setting. Patient complains of having headaches with the prodrome quoted as the following: "The sensation of having a man standing straight in my head"...yep, you read correctly...pretty weird huh?

Anyways here are the relevant images..click to enlarge:

It was isointense on T1 and there are no post-gadolinium images..differentials please..